/Engine/Source/Runtime/SlateCore/Public/Styling/SlateWidgetStyleContainerBase.h
Just a wrapper for the struct with real data in it.
class USlateWidgetStyleContainerBase : public [UObject](API\Runtime\CoreUObject\UObject\UObject), public [ISlateWidgetStyleContainerInterface](API\Runtime\SlateCore\Styling\ISlateWidgetStyleContainerInterf-)